Originally posted by Philoslothical Granted, we get this question way too much, and people should make some effort to find the answer themselves before asking it again, but the guy just registered to make this post, he might believe you for all we know.
The reason I responded with my less-than-helpful answer is because I was annoyed with the fact that a brand new user comes on the board, and he isn't even informed enough to know that the K-x and K-5 can use the same lenses, yet he thinks himself knowledgeable enough to slam a great camera, the K-x, dismissing it as "crappy". As a very happy K-x owner who is still in LOVE with my camera after two years, I was naturally a little defensive.
(And I may also be in a slightly worse than average mood since my Colts just lost their 11th straight game.)
Praterg: I apologize for the flippant response, since I usually go out of my way to help people on here. And I knew that somebody would quickly step in and provide the information you requested. That's the kind of place this is. So welcome to the forum.
Again, I believe the K-x is a great camera, and was the most bang-for-the-buck in it's day. In fact, I initially bought a Canon t2i, but returned it after a couple weeks and bought the K-x. No camera is perfect, but I find few shortcomings in the K-x, given its price. Perhaps its JPEG engine isn't perfect, but I've never heard that it's BAD. I've heard that it sometimes has a tendency to clip highlights, but it would hardly be the only camera to do that, and in most cases it would not ruin or seriously detract from the overall picture.
I always shoot in RAW, but the few times I've shot in JPEG (usually accidentally) I didn't notice any glaring image quality problems. So this evening I did an experiment, and set my K-x to JPEG and photographed some items I have here around the house. All of the pictures are JPEGs straight out of the camera, with no processing whatsoever. I had the JPEG set to the highest quality. I'm not seeing any problems with the JPEG files, but you can look for yourself and let me know if you see anything I'm missing.
Click on each of the pictures to open the full-size, 12MP image: